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An Image Compression Method Based on Dual Coding Mode

A technology of image compression and double coding, which is applied in image communication, digital video signal modification, electrical components, etc., can solve problems such as compression efficiency limitations, and achieve high-efficiency compression and good compression effects

Active Publication Date: 2018-05-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

In the traditional JPEG image compression method, data compression is not performed according to the regional characteristics of the image, which leads to certain limitations in the compression efficiency of the method

Method used

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  • An Image Compression Method Based on Dual Coding Mode
  • An Image Compression Method Based on Dual Coding Mode
  • An Image Compression Method Based on Dual Coding Mode

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Embodiment Construction

[0071] The present invention mainly adopts the mode of simulation experiment to verify the feasibility of the system model, and all steps have been verified by experiment. In order to realize the image compression based on the transform domain down-sampling technology, the specific implementation steps are as follows:

[0072] Step 1, image preprocessing

[0073] Set image width W=16 θ , the image height H=16 μ , where θ and μ are both natural numbers, divided into N=(W×H) / 16 according to the classic image block method in the traditional JPEG image compression method 2 A non-overlapping square image macroblock with a size of 16×16, denoted as b 1 , b 2 ,...,b i ,...,b N ; Here, W represents the width of the image, H represents the height of the image, N represents the total number of image blocks after the image is divided, i represents the index of the image block, i∈{1,2,...,N};

[0074] Step 2, two-dimensional discrete cosine transform of the image macroblock

[0075...

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Abstract

The present invention provides a kind of image compression method based on double coding mode, it is according to the characteristic of different areas in the image, each image macroblock utilizes a kind of "rate-distortion" optimization strategy, from the traditional JPEG image compression method and In the traditional image compression method based on the intelligent quantization algorithm, an efficient compression method is adaptively selected for compression to achieve efficient compression of the entire image, and different compression effects can be achieved for areas with different contents in the image. Compared with the existing JPEG image compression method, the image compression method provided by the present invention realizes the strategy of adaptively selecting a high-efficiency compression method according to the internal characteristics of the image, and can provide the most efficient compression method for different image regions.

Description

technical field [0001] The invention belongs to the field of image compression, and mainly relates to a method for adaptively selecting a coding mode according to internal characteristics of an image to perform image compression. Background technique [0002] Images are the most common and commonly used multimedia data in people's daily life. With the development of electronic information technology, the images taken by people have higher and higher resolutions, and storing and transmitting high-resolution images requires larger space and higher bandwidth. In order to save storage space and transmission bandwidth, it is necessary to use an efficient compression method to compress the original image data, so as to reduce the amount of data required to represent the image, and at the same time, it is necessary to ensure the quality of the compressed image. The most commonly used image compression method at present is a digital image compression method based on the JPEG compre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/103H04N19/136H04N19/147H04N19/176H04N19/91
CPCH04N19/103H04N19/136H04N19/147H04N19/176H04N19/91
Inventor 朱树元
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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